Mold for rotary valves.



G. GORTON.

MOLD r03 ROTARY VALVES. APPLICATION FILED FEB. 6. 1915.

Patented Apr. 27, 1915.

2 SHEETS-SHEET l- G. GORTON.

MOLD FOR ROTARY VALVES.

APPLICATION FILED FEB. 6. 1915.

1,137,203; Patented Apr. 27, 1915.

v 2 SHEET S-SHEET 2.

GEORGE eonron, ornacmn, Wisconsin; nssreivon ro ROBINSON & nonmson, or nacmn, wisconsm; A cornnmmnsm c. NSISTING ormcnnnn T."ROIBINSQN AND RICHARD '1. ROBINSON, JR.

mom) FOR RoirAnY VALVE-S,-

Specification of was Patent. P t nted Apr. 27, 1915.

' Application fil ed February 6, 1915i I Serial No. 6,445;

To all whom it may concern Be it known that I, GEORGE GoR'roN, aresident of Racine, in the county of Racine and State of Wisconsin, have invented -cer tain new and useful Improvements in Molds 'for Rotary Valves, of which the following is' a full, clear,.and exact description.

The invention relatesto molds for rotary valves.

In water cooled valves for multi-cylinder explosive engines, it has been found de sirable to employ a hollow valve with a v Water passage extending longitudinally therethrough and with integral portions in which through-ports are formed and with an integral gear for rotating the valve, and it'has also been found to be important to provide a hard, metal peripheral wearing surface and an interior of comparatively soft metal to withstand breaking stresses to which the valve is subjected in practice.

The object of the present invention is to provide an improved mold for casting valves of-this character.

A further object is to provide an improved mold for a rotary valve, which is efiicient in operation and wherefrom uniformity in casting will result.-

The invention consists in the several novel features hereinafter Set forth and more particularly defined by claiins'at the conclusion hereof. r

In the drawings: Figure 1 is a central vertical section of a mold embodying the invention and showing the manner of casting the valve. Fig; 2 is a detail perspective of the central core for forming the longitudinal opening in the valve. Fig. 3 is a of the mold, the pouring core being omitted.

Fig.6 is a section taken on line 6 6 of Fig.

1. Fig. 7 is a detail perspective of one of the sectional chill rings and the. core adapted to be held therein for forming a throughport in the valve, the parts being shown 'in separated relation. Fig. 8 is a detail perspective of the ring for forming the gear on the valve. I I, v i The improved mold is'adapted to form a hollow or cylindrical valve e which is adapted to rotatein a suitable valve-seat. .This

valve-"is formed with relatively offset 1 through-ports e '(one'for each-cylinder) to successively serve as exhaust and intake ,ports. This valve'is hollow or tubular to provide a passage or chamber e, extending water to flow longitudinally through the valve. At each end, the valve is formed with an integral cross-rib s, which serves as an abutment for means (not shown) for holding the valve longitudinally positioned in its seat. A- sprocket or gear-wheel Z, whereby the valve will be driven, is integrally .formed on the exposed portion of the rotary valve. In practice, it has been found to be of importance to provide a hard wearing surface on the periphery of the valve and toform theremaining portions of the valve of softer metal to render the valve less breakable and one of the objects of the invention is tO.-pr0vide a mold which will produce this result.

The improved mold comprises a base-plate 20 upon which a sleeve 21 is removably mounted, being positioned on the base-plate by a raised portion 22 of the plate, which fits into the lower end of the sleeve. Split chill-rings 24 are placed in superposed relation in the sleeve 21, and dry-sand cores 25 for forming the valve-ports e, are placed and held in these rings. Each chill-ring is formed of semi -cylindrical sections, the abutting edges of which have recesses 26 for receiving the ends of cores 25, so that each core will be held inthe contiguous recesses of the sections of a ring.

A key rib 27 is formed onthe inside of sleeve 21 and grooves 27 on the chill-rings serve to position the rings so that the ports will be formed at the proper relative angles to become successively operative in the rotation of the valve. Rib 27 also extends into a groove on the periphery of extension 22 of plate 20, so that it will be locked against rotation relative to said plate, and so that the chillrrings and port-cores will always be in same relative position to base-plate and sleeve. A one-piece chill-ring 28 is placed in the sleeve 21 on top of the uppermost chill-ring 24 and this ring 28 is provided with internal teethfor. forming the gear Z on the valve. A chill-ring 29 is placed on top of ring 2-8 to form one of the end portions of the valve, A cylindrical dry-sand leave s 'aces' betiween theinner periphery of "the chill-rings and the outer peripher of the core to form the cylindrical Wallv the valve. This dry-sand core 30' is provided with cross-openings 38 around cores 25 to form the surrounding walls of the ports 6 in the valve, and with cavities 30 for forming the end lugs .s in the valve. A cavity 31 is formed in the base 20 'to receive a reduced lower end of the core 30 and a vent 3.2 is formed in said core in the base 20. This end 30 and cavity 31 are irregularly formed so that the core can enter the cavity only when the core is in proper relative position to the spaces, are formed in said pouring-core.

vent 36 is formed in the upper end of the dry-sand core 30 and a cross-vent 37 is formed in the pouring core 33.

In assembling the mold, the dry-sand core '30 is first placed on the base-plate 20. A

core 25 is' then passed through the lowermost v opening 38 in the core 30 and is held therein by placing the sections of the lowermost chill-ring 24: in position around the core 30. The remaining cores 25 and; chill-rings 24 are successively placed in superposed rela-' tion around the core 30 in the same manner. Nezrt, the chill-rings 28 and 29 are placed in position. Sleeve 21 is then dropped over the vertical series of chill-ringsand into posi- .tion on late 20, so that 'all of the chillrings wil be held in superposed relation and in proper relative position to form the valve and through-ports. therein. This sleeve can be lowered into position only when the grooves 27"are alined with the groove for rib 27 in the plate 20, and as a resultall the port-cores will be correctlypositioned in the central core .30 to form the walls around the ports and to form them in proper :eorrelative position. The pouring gate.33 is'then placed in position, whereupon the entiremold will be assembled for a casting operation.

When the-metal is poured into the pour lug-gates 35, it will flow into the spaces cor responding tothe' shape of the valve and integrally form all portions of said valve. The metal formin the outer or peripheral por tion of the cy indrical wall of the valve will be chilled as it. comes in contact with the chill -rings for a distance, corresponding in 1 practice to about gth of an inch -Inthe sleeve.

wardly of the chilled portion, the metal'will' anneal, because the dry-sand coreswill not have any chillin effect upon the metal. As

a resultof mol mgthe valvein this manv ner, its periphery will be harder or denser than the inner portion of the metal wall of 7 0 This 'will' provide the desired wear-surface on the outer periphery and the annealed inner portion will be less brittle 'to resist breakage, resulting from a shock or blow. The gear '1 will also be chilled so that it will not readil wear.

\Vhen the casting has been formedllini the mold, it will be removed therefrom'in the following manner; the pouring gate 33 will be removed, sleeve 21 will then be lifted away from the chill-rings and the latter'be- I ing formed in sections can be removed from the casting.

The invention thus exemplifies a 'mold which is particularly adapted for forming a hollow rotary valve with through-ports therein and by which the valve will be formed with inner and outer metal. portions of different densities. I

The invention is not to be understood as restricted to the details set forth, since these may be modified within the scope of the .ap-

pended claims, without departing from the spirit andscope of the invention.

Having thus described the invention, what] I claim as new and desire to secure by Let- Q ters Patent; is: r

1. In a mold for engine valves, the combination of a central core for forming a longitudinal duct in the valve, cores for forming ports, fthrough the valve, sectional-rings around the central core, provided with means for holding the port-cores, and means for holding said rings together.

2. In a mold for engine valves, the com: bination of a central core for forming a longitudinal duct in the valve, cores forforming ports through the valve, sectional chill-rings around the centralcore and provided'with means for holding theporbcores,

and means for holding said rings together.

3. In a mold for engine valves, thecombi nation of a central core for forming alongi tudinal duct in the valve, cores forforming sectional rings around the central core provided with reces'sesin their contiguous ends for holdingthe port cores-p and means for holding said rings together.

4. Ina mold for engine valves, the combination of a central core for forming a:

ports in the valve,

longitudinal duct .in the valve, cores for forming ports through the valve, sectional Q chill-rings around the central core-and pro:

vided with means for holding the port-cores and a sleeve fitting around the sections of i the rings serving to hold them together.

5. In a mold for engine valves, the combination of a central core for forming a longi tudinalduct Inthe valve, cores for forming tudinal duct in the valve, cores for forming ports inthe valve, sectional-rings around the central core, provided with recesses 1n their contiguous ends for holding the portcores, and a sleeve fitting around the sectional rings and serving to hold them together. -.-7.-.In a mold for engine valves, the com bination of a central' core for forming a longitudinal duct in the valve, cores forforming ports through the valve, sectionalaround the central core and provided With means forv holding the port-cores, a

base plate, and a sleeve oni-the base plate and by which the sections of the rings are held g bination of a central core for forming a lon' together. I 8. In a mold for engine ports in the-valve, chill-rings formed of'separable sections around the central core and' provided with means fonholding the ports.

tudinal duct in the valve, cores for forming ports in the valve, superposed rings formed of separable sections around the central core and provided with means for holding the port-cores, a base, and a sleeve on the base by which the rings are held together, the

lowervend of the central core and the beingprovided with a vent.

10. In a mold. for engine valves, the combination of a central core for forming a longitudinal duct in the valve, cores for forming ports through the valve, sectional rings around the central core and provided with means for holding the port-cores, a sleeve fitting around the sectional rings, and an interfitting connection between the rings and the sleeve .for holding the rings against rotation and relatively positioning the rings and port-cores therein. 11. In a mold for engine valves, the com? bination of a central core for forming a longitudinal duct in the valve, cores for forming ports through the valve, sectional rings around the central core and provided with means ,for holding the port-cores, a sleeve fitting around the sectional rings and an interfitting rib and groove connection between the rings and the sleeve for holding the rings against rotation and relatively positioning the rings and port-cores therein.

12. In a mold for engine valves, the complate valves, the combination of a centralcore' for forming a longi-- tudinal duct'in the valve, cores. for. forming binationof a central core for forming a longitudinal duct in the valve, cores for forming ports through the valve super im posed rings formed of separable sections, around the central core and provided with means for holding the port-cores, a sleeve fitting around the split ring, a one-piece ring above the sectional-rings, and an interfitting connection between said rings and the sleeve for holding the rings against rotation'and relatively positioning the rings and portcores therein.

13. Ina-mold for engine valves, the combination..,o f a central core for forming a longitudinal opening in the valve, cores for forming ports in the valve, superimposed rings aroundthe central core and provided with means for holding the port-cores, a ring having means for forming teeth on the periphery of the valve, and means for holdmg. said rings together. 7 v 14. In a mold for engine-valves, the comgitudinal duct in the valve, cores for formrings formed of separable sections, around the central core and provided with means for holding the port-cores, a ring having means for forming teeth on the periphery of the valve, and a sleeve around said rings.

15. In a mold for engine valves, the combination of a central corefor forming a longitudinal duct in the valve, cores for forming ports through the valve, superimposed, rings formed of separable sections, around the central core and provided with means for holding the port-cores, a one-piece ring having means for forming teeth on the periphery of the valve, and means for holding said rings together.

16. In a mold for engine valves, the combination of a central core for forming a longitudinal duct in the valve, cores for forming ports in the valve, superimposed rings around the central core and provided with meansfor holding the port-cores, a

base-plate, an interfitting connection between the base-plate and the central-core whereby said core will be held against rotation relatively to the plate, anda sleeve around the rings.

17. In a mold for engine-valves, the com bination of a central core for forming a longitudinal duct in the valve, cores for forming ports through the valve, superimposed rings formed of separable Sections, around the central core and provided with means for holding the port-cores, a baseplate, an interfitting connection between the base-plate and thecentral core whereby said core will be held against rotation relatively to the plate, and a sleeve around the rings.

18. In a mold for engine valves, the combination of a central core for forming a longitudinal duct in the valve, cores for forming ports.=through the valve, superimposed. rings around the central core, provided with means for holding the portcores, a base-plate, an interfitting connection between the base-plate and the central core whereby said core will be held against rotation relatively to the plate, a sleeve around the split rings, and an interfitting connection between the plate and the sleeve for relatively positioning the plate and sleeve.

19.- In a mold for engine valves, the combination of a central core for forming a longitudinal duct in the valve, cores for forming ports through the valve;superimposed rings around the central core and provided with means for holding the portcores, a base-plate, an interfitting connection bet'ween'the base-plate. and the central core whereby said core will be held against rotation relatively to the plate, a sleeve around the rings, and an interfitting connection between the rings and the sleeve for relatively positioning them with respect to the central core.

' 20. In a mold for engine valves, the com-- "means for holding the port-cores, a baseplate, an interfitting connection between thebase-plate and the central core whereby said core will be held against rotation relatively to the plate, a sleeve around the split rings, and interfitting connections between the rings and the sleeve-and the sleeve and said I plate for relatively positioning them with rings together, and a pouring-core held in the upper end of said sleeve.

22. In a mold for engine valves, the combination of a central core, for forming a longitudinal. opening in the valve, cores for forming ports in the valve, sectional rings around the central core and provided with means for holding the port-cores, a sleeve fitting around the split rings, serving to hold them together, the sleeve being formed with an enlarged recess at its upper end and a pouring core held in said recess.

23. In a mold for engine valves, the combination of a central core for forming a longitudinal duct in the valve, cores for forming ports through the valve, superimposed rings around the central core and pro vided with means for holding the portcores, a sleeve fitting around the split rings, serving to hold them together and a pouring core held in the upper end of said sleeve, and provided witha vent for the escape of gases from the casting space.

GEORGE GORTON,

' Witnesses: 5

C. ,ELLANDSON, G. E. GUSTAFSON.... 

